Stopper rod for tube rolling mills



July 22, 1969 w, VQM DORP ET AL 3,456,475

STOPPER HOD FOR TUBE ROLLING MILLS Filed Sept. 22, 1966 lnvenfors Mam V n Amp and Mm: sme m United States Patent 3,456,475 STOPPER ROD FOR TUBE ROLLING MILLS Walter vom Dorp, Rheydt, and Hans Eversberg, Duesseldorf-Rath, Germany, assignors to Mannesmann-Meer Aktiengesellschaft, Monchen-Gladbach, Germany, a

corporation of Germany Filed Sept. 22, 1966, Ser. No. 581,384 Int. Cl. B21b 17/02; B21c 1/24 US. Cl. 72209 1 Claim ABSTRACT OF THE DISCLOSURE A stopper rod for tube rolling mills with aligned rolling passes is held longitudinally immovably and protrudes through the passes and includes a stopper for, positioned in, each rolling pass, and each stopper is added, at a seat, to the rod by welding, and is composed of high-quality material and has an outside diameter that is larger than that of the rod.

The invention relates to rolling mills, and relates more particularly to rolling mills of the type in which in a continuous sequence, by means of a fixed stopper rod and by means of rolling passes, blooms are rolled into tubes having a specific end profile.

Continuously operating rolling mills of this type are known which have, for instance, a plurality of aligned passes, through which there protrudes a tensile stressed stopper rod that provides for stoppers of uniform or of variable thickness (German Patent No. 115,142), the stoppers being positioned on the rod by means of keys.

US. Patent No. 2,025,439 shows another example of this type rolling mill, wherein an inwardly cooled rod has stoppers that are screwed on with the aid of spacing supports.

It is among the principal objects of the invention to provide continuously operating mills of the aforesaid type wherein several aligned rolling passes are provided through which there protrudes a fixed stopper rod that carries stoppers, which rod-and-stoppers-arrangement is characterized by great economy.

It is another object of the invention to bring about the aforesaid economy by increasing the life span of the rod and stoppers arrangement.

It is a further object of the invention to provide for such economy by the particular material of the stoppers used and the manner of positioning of the stoppers on the rod.

Further objects and advantages of the invention will be set forth in the following specification and in part will be obvious therefrom without being specifically referred, to, the same being realized and attained as pointed out in the claims hereof.

Broadly speaking, the instant solution provides for stoppers of high-alloyed materials which are either welded or otherwise added to the rod; and in accordance with a preferred embodiment, these stoppers may be positioned in seats formed in recesses of the stopper rod.

The instant invention offers the following advantage.

The rod needs to withstand only tensile stresses and heat "ice instant invention provides for the improvement of the quality of the material at these working portions by adding, for instance, by welding, or other process as previously explained, of a high-quality material, that has a diameter larger than that of the remainder of the rod. Thus, substantially only the high-quality material will be in contact with the internal surface of the tube during the rolling operation. This, of course, subjects the stopper to a high degree of wear. The aforesaid welding, or the like, of the high-quality material onto these portions may, however, be done repeatedly, so that the life span of the rod-stopper-assembly, by repeated reconstruction of the aforesaid type may be extended substantially indefinitely.

As indicated in the foregoing, the rod may have seats; these seats form recesses in the external surface of the rod, and hence have a smaller diameter than the rod without stoppers. By the arrangements of these seats, the welding or plating or armor-plating are assured of increased adhesion to the rod.

It is among the important values of the invention to provide an economical and simplified construction of a stopper rod with stoppers wherein, furthermore, highalloyed materials are used only in small quantities and hence at the modest weight of the welding, so that the assembly of rod and stoppers in accordance with the instant invention is characterized by a considerable saving in material and in production costs.

For a fuller understanding of the nature and objects of the invention, reference should be had to the following detailed description, taken in connection with the accompanying drawing, in which the single view is a fragmentary vertical sectional view of a rolling mill with a stopper rod in accordance with an embodiment of the instant invention.

A stopper rod 1 is provided that protrudes through two aligned rolling passes provided by rolls 5. As previously explained, the rod 1 may extend through more than two aligned rolling passes.

On the rod there are mounted a plurality of stoppers 2 which are either welded or otherwise added to the rod 1. In accordance with a preferred embodiment, the stoppers 2 are seated in recesses 3 of the stopper rod 1. The rods 1 and the stoppers 2 thereof are disposed inside a tube 4. A stopper 2 is disposed in each rolling pass. The tube 4 is reduced by the rolling passes of the rolls 5 which, as pointed out hereinbefore, are positioned about a stopper 2 each.

The rod 1 is held against longitudinal movement in its position by conventional suitable means, not shown in the drawing.

We wish it to be understood that we do not desire to be limited to the exact details of construction shown and described, for obvious modifications will occur to a person skilled in the art.

Having thus described the invention, what we claim as new and desire to be secured by Letters Patent is as follows:

1. A stopper rod, for use in connection with a tube rolling mill having a plurality of aligned rolling passes, said rod being positioned longitudinally immovably and to protrude through said passes and including a stopper for each rolling pass positioned in the rolling pass, said stoppers being welded on said rod and composed of highquality material and having an outside diameter larger than the external diameter of said rod, said rod having 3 4 a recess in its external surface for each stopper defining 2,025,439 12/1935 Brownstein 7214 a seat, each stopper being mounted in and surrounding 3,237,441 3/ 1966 Eberle 72-209 and surmounting said seat.

CHARLES W. LANHAM, Primary Examiner References Cited 5 E. M. COMBS, Assistant Examiner UNITED STATES PATENTS 988,569 4/1911 Hankness 72-209 1,931,571 10/1933 Burns 72-401 72283, 370 

